SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b95bdf3968bd4f481a00f8b1a6d456e1098dcc723c2476705710a332c1fc2400' 
  AND token = 'utJBnPJzV4ubo/GKRan0FhMemNykD6XCzr+vXRfFlJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}